2 | Pieces turn around the board, they cannot go in the middle.
5 Each side has only a king, two rooks, one bishop and two pawns.
6 Pieces can never enter the central area.
7 Pawns can only move "clockwise", acording to the image below: they move
8 and capture forward straight and diagonally in the arrow direction.
11 img.img-center(src="/variants/Rollerball/rollerball_directions.gif")
12 figcaption.text-center.
13 Main directions on the board.
14 The squares where direction changes are enlighted with white arrows.
17 When a pawn reaches the starting square of an enemy pawn, it promotes
18 into a bishop or rook.
21 Rooks and bishop move as usual, but are restricted to one square only when
22 moving counter-clockwise.
23 Moreover, they are allowed one rebound in certain circumstances:
25 li a bishop rebounds on the first wall met,
26 li a rook rebounds (at 90 degrees) if it reaches a corner.
29 img.img-center(src="/variants/Rollerball/rook_example.gif")
30 figcaption.text-center Some rook movements.
33 The king moves as in orthodox chess.
34 The goal is either to bring your king on the initial square of the
35 opponent's king, or to checkmate him.
41 a(href="http://history.chess.free.fr/rollerball.htm") author's presentation
43 a(href="https://www.chessvariants.com/40.dir/rollerball/index.html")
47 p Inventor: Jean-Louis Cazaux (1998)